"Foreign visitors spent over 725 million pounds (USD 884 million, 830 million euros)... In December, as the weakened pound prompted an influx of bargain hunting 'Brexit tourists' to the UK over the Christmas period," said a report from card payments processor Worldpay.
It said spending on foreign cards surged 22 per cent year-on-year, handing an extra 130 million pounds to UK retailers compared with the same month in 2015.
US and Russian outlay grew also by around a quarter.
And the amount spent by French and German tourists over the festive period was up by 14 per cent.
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"UK retail centres, including London's West End, are a magnet for visitors from all over the world, made all the more attractive by the bargains on offer as a result of the weakened pound," said James Frost, chief UK marketing officer at Worldpay.
Irish spend was up more than 46 percent, although this likely included a number of people holding euros from southern Ireland simply crossing the border into Northern Ireland where the currency is sterling.
Swiss-held cards meanwhile showed a drop in spending of 1.8 per cent in December, according to Worldpay data.
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